Reindexing of the same document

Elastic Stack Elasticsearch
1

What will happen if we upsert an existing document with the same content and the same id? Will it trigger reindexing? Or it will detect that nothing is changed and will do nothing?

2

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POST test/_doc/1
{
  "value": 1
}

Response;

{
  "_index" : "test",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 0,
  "_primary_term" : 1
}

POST test/_doc/1
{
  "value": 1
}

Response;

{
  "_index" : "test",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 2,
  "result" : "updated",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 1,
  "_primary_term" : 1
}
3

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